We love when designers get to thinking about how to create hip accommodations for kitties. In the past, we've featured covered litter boxes inspired by mid-century modernism and feral cat shelters inspired by Frank Lloyd Wright (yes, seriously). Today, we bring you Catissa, a wooden, four-story house meant to be affixed to a wall. Conceived by Mojorno, a Russian design studio, Catissa gives cats a bird's eye view of the house while also providing "a safe place" for them to take a nap. "Dogs and children can't get them," the designer says. Plus, the smooth surface makes for easy cleaning.